Don't connect DummyNilNode when there's no else clause

Author: coord-e

lib/typeprof/core/ast/control.rb

@@ -366,8 +366,8 @@ def initialize(raw_node, lenv)
           end
           raw_res = raw_res.subsequent
         end
-        @else_clause = raw_node.else_clause&.statements ? AST.create_node(raw_node.else_clause.statements, lenv) : DummyNilNode.new(code_range, lenv)
-        @ensure_clause = raw_node.ensure_clause&.statements ? AST.create_node(raw_node.ensure_clause.statements, lenv) : DummyNilNode.new(code_range, lenv)
+        @else_clause = AST.create_node(raw_node.else_clause.statements, lenv) if raw_node.else_clause&.statements
+        @ensure_clause = AST.create_node(raw_node.ensure_clause.statements, lenv) if raw_node.ensure_clause&.statements
       end
 
       attr_reader :body, :rescue_conds, :rescue_clauses, :else_clause, :ensure_clause

scenario/control/begin.rb

@@ -9,7 +9,7 @@ def foo
 
 ## assert
 class Object
-  def foo: -> (Integer | String)?
+  def foo: -> (Integer | String)
 end
 
 ## update
@@ -23,7 +23,7 @@ def foo
 
 ## assert
 class Object
-  def foo: -> Integer?
+  def foo: -> Integer
 end
 
 

scenario/control/ensure.rb

@@ -15,5 +15,5 @@ def foo(n)
 ## assert
 class Object
   def bar: (String) -> nil
-  def foo: (Integer) -> Float?
+  def foo: (Integer) -> Float
 end